[R] Semi continous variable- define bounds using lpsolve

[pragathichi]

How to define bounds for a semi continous variable in lp_solve.
Min 5x1 +9x2 +7.15x3 +0.1x4
subject to 
x1+x2+x3+x4=6.7
x1+x4 <= 6.5
And x3 can be 0 or greater than 3.6
hence x3 is  a semi continous variable 
how to define bounds as well as semicontinous function because using 
set.semicont and set. bound simantaneously doesn't seem to work.Thanks in
advance for the help
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